/* ===== Container ===== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ===== Sections ===== */

.section {
  padding-block: var(--sp-xl);
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section__header {
  text-align: center;
  margin-bottom: var(--sp-lg);
}

.section__subtitle {
  margin-top: var(--sp-xs);
  color: var(--color-ink-mute);
  font-size: var(--fs-body);
  max-width: 640px;
  margin-inline: auto;
}

/* ===== Header ===== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-rule);
}

.site-header .container {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--sp-md);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--ff-display);
  font-size: 1.5rem;
  color: var(--color-gold);
  white-space: nowrap;
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo__icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

@media (min-width: 1024px) {
  .header-logo__icon {
    width: 32px;
    height: 32px;
  }
}

.header-logo:hover {
  color: var(--color-gold-hi);
}

.header-nav {
  display: none;
  gap: var(--sp-md);
  margin-left: auto;
  align-items: center;
}

.header-nav a {
  font-family: var(--ff-ui);
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-ink-mute);
  white-space: nowrap;
  transition: color var(--duration) var(--ease);
}

.header-nav a:hover,
.header-nav a:focus-visible,
.header-nav a.is-active {
  color: var(--color-gold);
}

.site-header .header-cta {
  display: none;
  margin-left: var(--sp-sm);
  flex-shrink: 0;
}

@media (min-width: 1024px) {
  .site-header .header-cta {
    display: inline-flex;
  }
}

/* Burger */
.burger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-left: auto;
  padding: 6px;
  width: 36px;
  background: none;
  border: none;
  cursor: pointer;
}

.burger span {
  display: block;
  height: 2px;
  background-color: var(--color-ink);
  border-radius: 1px;
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}

.burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu — overlay + dropdown */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 98;
  background-color: rgba(0, 0, 0, 0.5);
}

.mobile-menu-overlay.is-open {
  display: block;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  z-index: 99;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-rule);
  padding: var(--sp-sm) var(--container-pad) var(--sp-md);
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  max-height: calc(100vh - var(--header-h));
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.mobile-menu.is-open {
  display: flex;
}

.mobile-menu a {
  font-family: var(--ff-ui);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-ink);
  padding: var(--sp-xs) 0;
  border-bottom: 1px solid var(--color-rule);
}

.mobile-menu a.is-active {
  color: var(--color-gold);
}

.mobile-menu a:last-child {
  border-bottom: none;
}

@media (min-width: 1024px) {
  .header-nav {
    display: flex;
  }

  .burger,
  .mobile-menu,
  .mobile-menu-overlay {
    display: none !important;
  }
}

/* ===== Back to top ===== */

.back-to-top {
  position: fixed;
  bottom: var(--sp-md);
  right: var(--sp-md);
  z-index: 90;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-gold);
  color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--duration) var(--ease),
    visibility var(--duration) var(--ease),
    transform var(--duration) var(--ease),
    background-color var(--duration) var(--ease);
  cursor: pointer;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background-color: var(--color-gold-hi);
  box-shadow: 0 4px 20px rgba(212, 167, 68, 0.3);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===== Footer ===== */

.site-footer {
  border-top: 1px solid var(--color-rule);
  padding-block: var(--sp-xl) var(--sp-lg);
  background-color: var(--color-bg);
}

.footer-grid {
  display: grid;
  gap: var(--sp-lg);
}

.footer-col .header-logo {
  font-size: var(--fs-ui);
  font-weight: 500;
  margin-bottom: var(--sp-sm);
}

.footer-col h4 {
  font-family: var(--ff-ui);
  font-size: var(--fs-ui);
  font-weight: 500;
  color: var(--color-gold);
  margin-bottom: var(--sp-sm);
}

.footer-col a,
.footer-col p {
  font-size: var(--fs-small);
  color: var(--color-ink-mute);
  line-height: 1.8;
}

.footer-col a:hover {
  color: var(--color-gold);
}

.footer-bottom {
  margin-top: var(--sp-lg);
  padding-top: var(--sp-sm);
  border-top: 1px solid var(--color-rule);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-sm);
  font-size: var(--fs-small);
  color: var(--color-ink-mute);
}

.footer-bottom img {
  width: 28px;
  height: 28px;
  opacity: 0.5;
}

.footer-contacts {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-contacts a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.footer-contact-icon {
  width: 18px;
  height: 18px;
  object-fit: contain;
  flex-shrink: 0;
}

.footer-bottom__disclaimer {
  margin-left: auto;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

/* ===== Grids ===== */

.grid-3 {
  display: grid;
  gap: var(--sp-lg);
}

.grid-6 {
  display: grid;
  gap: var(--sp-lg);
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-6 {
    grid-template-columns: repeat(3, 1fr);
  }
}